diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-09 10:10:27 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-09 10:13:04 +0100 |
| commit | 07989b7ad63af424886ff922fd3bcca9e00ffa78 (patch) | |
| tree | 5c3107ae9a50906de180addf6a111dab60e2427d /arch/arm/mm/proc-v7.S | |
| parent | 17ee083b7897ab27b4949c42de805889ebd2b4c5 (diff) | |
Revert "ARM: 6943/1: mm: use TTBR1 instead of reserved context ID"
This reverts commit 52af9c6cd863fe37d1103035ec7ee22ac1296458.
Will Deacon reports that:
In 52af9c6c ("ARM: 6943/1: mm: use TTBR1 instead of reserved context ID")
I updated the ASID rollover code to use only the kernel page tables
whilst updating the ASID.
Unfortunately, the code to restore the user page tables was part of a
later patch which isn't yet in mainline, so this leaves the code
quite broken.
We're also in the process of eliminating __ARCH_WANT_INTERRUPTS_ON_CTXSW
from ARM, so lets revert these until we can properly sort out what we're
doing with the ARM context switching.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-v7.S')
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index b3b566ec83d..3c3867850a3 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -108,16 +108,18 @@ ENTRY(cpu_v7_switch_mm) #ifdef CONFIG_ARM_ERRATA_430973 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB #endif - mrc p15, 0, r2, c2, c0, 1 @ load TTB 1 - mcr p15, 0, r2, c2, c0, 0 @ into TTB 0 +#ifdef CONFIG_ARM_ERRATA_754322 + dsb +#endif + mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID + isb +1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 isb #ifdef CONFIG_ARM_ERRATA_754322 dsb #endif mcr p15, 0, r1, c13, c0, 1 @ set context ID isb - mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 - isb #endif mov pc, lr ENDPROC(cpu_v7_switch_mm) |